Inside Our Aluminum Extrusion Factory: Advanced Production and Strict Quality Control

State-of-the-Art Billet Casting and Homogenization

Our aluminum extrusion journey begins not at the press, but in our dedicated casting facility where raw aluminum alloys are transformed into perfectly homogeneous billets. We utilize direct-chill (DC) casting technology, which allows for precise control over solidification rates. This process begins with carefully selected scrap and primary aluminum, which are melted in a gas-fired reverberatory furnace. The molten metal is then degassed using a rotating impeller system that injects argon gas to remove hydrogen and reduce oxides. Following degassing, the metal passes through a ceramic foam filter to trap any remaining inclusions. The filtered melt is then poured into a water-cooled mold, where it solidifies into a cylindrical billet. The critical step here is the homogenization cycle, which occurs immediately after casting. Billets are placed in a multi-zone homogenizing furnace and held at a temperature between 550°C and 590°C for 6 to 12 hours, depending on the alloy. This heat treatment dissolves soluble phases, eliminates micro-segregation, and transforms the as-cast dendritic structure into a more uniform, equiaxed grain structure. The result is a billet with consistent mechanical properties and improved extrudability, reducing the risk of surface defects and die wear during the subsequent extrusion process.

Precision Die Design and Manufacturing

Our die shop is the heart of the extrusion operation, where engineering meets craftsmanship. Every die begins with a 3D CAD model of the desired profile, which is analyzed using finite element analysis (FEA) software to predict metal flow, stress distribution, and potential deflection. The die design incorporates a bearing length—the critical surface that shapes the final profile—which varies from 2mm to 12mm depending on the wall thickness and complexity. For multi-hollow profiles, we use a porthole die system where the aluminum is split into multiple streams, then re-welded in the welding chamber before exiting through the die orifice. The die is machined from H13 tool steel using a 5-axis CNC milling machine, achieving tolerances of ±0.02mm. After machining, each die undergoes a rigorous heat treatment process: preheating to 650°C, austenitizing at 1020°C, oil quenching, and triple tempering at 560°C to achieve a hardness of 48-52 HRC. The final step is nitriding, a surface hardening process that creates a wear-resistant layer 0.15mm deep. Before any production run, the die is tested on a sample billet, and the resulting profile is measured using a coordinate measuring machine (CMM) to verify all dimensions. Only dies that pass this inspection with 100% compliance are released to the production floor.

Advanced Extrusion Press Operations

Our extrusion press line features a 2,500-ton direct-drive press capable of producing profiles up to 12 inches in diameter. The process begins with preheating the homogenized billet in an induction heater to a precise temperature between 450°C and 500°C, depending on the alloy and profile complexity. The heated billet is then transferred to the press container, which is maintained at 400°C to prevent heat loss. The ram, driven by a hydraulic system, applies pressure of up to 15,000 psi to force the aluminum through the die. The extrusion speed is a critical parameter: for simple solid profiles, speeds can reach 60 meters per minute, while complex hollow profiles require slower speeds of 10-25 meters per minute to ensure proper metal flow and avoid tearing. The extruded profile exits the die at temperatures between 520°C and 560°C and is immediately quenched using a water spray system. The quench rate is carefully controlled: for 6063 alloy, a water mist is used to achieve a cooling rate of 30-50°C per second, while for 6061, a more aggressive water spray is employed. After quenching, the profile passes through a stretcher that applies a 0.5-2% elongation to straighten the profile and relieve residual stresses. The final step is cutting to length using a flying saw that operates in sync with the extrusion speed, achieving cut tolerances of ±1mm.

In-Line Heat Treatment and Aging

After extrusion and quenching, the profiles are not yet at their final mechanical properties. They must undergo artificial aging to achieve the desired temper. Our facility uses a continuous aging furnace system that processes profiles in batches on moving racks. The aging cycle is precisely controlled: for T5 temper, profiles are aged at 175°C for 6-8 hours; for T6 temper, the temperature is 180°C for 8-10 hours. The furnace is equipped with multiple thermocouples that monitor temperature uniformity to within ±3°C across the entire load. During aging, the alloying elements (primarily magnesium and silicon) precipitate out of solid solution, forming Mg2Si particles that strengthen the aluminum. The aging time and temperature are critical: under-aging results in insufficient strength, while over-aging can cause the material to become brittle. After aging, samples from each batch are tested for tensile strength, yield strength, and elongation using a universal testing machine. For 6063-T5, the minimum yield strength is 110 MPa, while for 6061-T6, it is 240 MPa. Any batch that fails to meet these specifications is either re-aged or scrapped. The entire heat treatment process is documented with a batch number, allowing full traceability from billet to finished profile.

Surface Finishing and Anodizing

Our factory offers a comprehensive range of surface finishes, with anodizing being the most popular for architectural and consumer applications. The anodizing line consists of a series of tanks: first, the profiles are degreased in a mild alkaline solution at 60°C for 5 minutes, then rinsed. Next, they undergo an etching step in a 5% sodium hydroxide solution at 50°C for 3-10 minutes, which removes a thin layer of aluminum to create a matte finish. The profiles are then desmutted in a 50% nitric acid solution to remove the dark smut formed during etching. The actual anodizing occurs in a sulfuric acid electrolyte (15-18% concentration) at 20°C, with a current density of 1.5-2.0 A/dm². The anodizing time determines the coating thickness: for architectural applications, a 20-micron coating requires 60 minutes, while for marine environments, a 25-micron coating takes 75 minutes. The anodic layer is porous after formation, so a sealing step is essential. Our factory uses a hot water seal at 95°C for 20 minutes, which hydrates the oxide layer and closes the pores, providing corrosion resistance. For colored anodizing, the profiles are immersed in an organic dye bath before sealing. The final inspection includes a coating thickness measurement using an eddy current gauge, a seal quality test using a dye stain test, and a corrosion resistance test in a salt spray chamber for 500 hours.

Non-Destructive Testing and Dimensional Inspection

Quality control is embedded in every step of our production, with non-destructive testing (NDT) being a cornerstone. Every profile is inspected using an eddy current system that detects surface cracks, seams, and inclusions down to 0.1mm depth. The system uses a probe that encircles the profile as it moves through the line, generating a magnetic field that is disrupted by any discontinuity. For critical applications like aerospace components, we also employ ultrasonic testing to detect subsurface defects. The ultrasonic probe sends high-frequency sound waves into the material, and any internal flaw reflects the wave back to the receiver. Dimensional inspection is performed using a laser profile scanner that measures the cross-section of the profile at 1-meter intervals. The scanner captures over 1,000 points per cross-section and compares them to the CAD model in real-time. Any deviation beyond ±0.1mm triggers an alarm, and the operator can adjust the die temperature or extrusion speed to correct the issue. Additionally, we use a coordinate measuring machine (CMM) for random samples, checking critical dimensions like wall thickness, corner radii, and twist. All inspection data is logged into our quality management system, which generates a certificate of conformance for each batch.

Mechanical Testing and Certification

To ensure our profiles meet international standards like ASTM B221 and EN 755, we conduct comprehensive mechanical testing in our on-site laboratory. Tensile testing is performed on a 100kN universal testing machine using samples machined from the profile. The test measures yield strength (0.2% offset), ultimate tensile strength, and elongation. For 6063-T5, typical results show a yield strength of 120-140 MPa and elongation of 12-15%. Hardness testing is done using the Brinell method with a 500kg load and a 10mm ball indenter, giving a hardness value of 60-70 HB for 6063-T5. We also perform a bend test to check ductility: a sample is bent 180 degrees around a mandrel with a radius equal to the profile thickness, and no cracks should appear on the outer surface. For profiles intended for welding, we conduct a microstructural analysis using optical microscopy to examine the grain structure and ensure no excessive grain growth occurred during extrusion. Each test result is recorded and attached to the batch number, allowing full traceability. Our quality management system is ISO 9001:2015 certified, and we can provide EN 10204 Type 3.1 inspection certificates for every order. For aerospace applications, we also maintain NADCAP accreditation for heat treatment and NDT processes.

Packaging, Logistics, and Traceability

The final stage of our production process is packaging, which is designed to protect profiles during transit and storage. Profiles are first wrapped in a layer of plastic film to prevent moisture and dust contamination. For anodized profiles, we use a special acid-free paper to avoid chemical reactions. The profiles are then placed in wooden crates or metal racks, depending on the customer’s requirements. Each bundle is secured with nylon straps and corner protectors to prevent movement. A barcode label is attached to each bundle, containing the batch number, alloy, temper, profile code, length, quantity, and date of manufacture. This barcode links to our ERP system, allowing customers to track the entire production history of their profiles. For export shipments, we use fumigated wooden crates and include a packing list with detailed dimensions and weights. Our logistics team coordinates with freight forwarders to optimize shipping routes, whether by sea, air, or land. For time-sensitive orders, we offer express shipping with real-time tracking. The entire packaging process is documented with photographs, which are stored in the quality record for each order. This ensures that any damage claims can be verified against the packaging condition at the time of dispatch.

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What is the difference between T5 and T6 temper in aluminum extrusion?

The T5 and T6 tempers represent different heat treatment processes applied to aluminum extrusions to achieve specific mechanical properties. T5 temper is achieved by cooling the extrusion after the hot working process (extrusion) and then artificially aging it. The cooling from extrusion is typically done using air or water quenching, followed by aging at a temperature of around 175°C for 6-8 hours. This process results in moderate strength and good formability, making T5 ideal for architectural applications like window frames and curtain walls where appearance and moderate strength are sufficient. In contrast, T6 temper involves a solution heat treatment step where the extrusion is heated to a higher temperature (around 520°C) and held for a period to dissolve alloying elements, then rapidly quenched to retain them in solid solution, followed by artificial aging at a higher temperature (around 180°C) for a longer duration (8-10 hours). This process produces higher strength, with yield strengths typically 30-50% higher than T5. For example, 6063-T5 has a minimum yield strength of 110 MPa, while 6063-T6 has a minimum of 170 MPa. However, T6 temper also results in lower elongation and reduced formability, making it less suitable for bending or forming operations. The choice between T5 and T6 depends on the application: if the profile needs to be bent or formed after extrusion, T5 is preferred; if maximum strength is required, T6 is chosen. Additionally, T6 temper requires more energy and time, increasing production costs by approximately 15-20% compared to T5. It is also important to note that not all alloys respond equally to T6 treatment; alloys like 6061 and 6082 are commonly used in T6 temper for structural applications, while 6063 is more often used in T5 for architectural purposes. The decision should be based on a careful analysis of the mechanical requirements, fabrication processes, and budget constraints.

How do you control the wall thickness tolerance of extruded profiles?

Controlling wall thickness tolerances in aluminum extrusion is a multi-faceted challenge that requires precise control over several parameters. The primary factors influencing wall thickness include die design, billet temperature, extrusion speed, and die temperature. Our approach begins with die design: the bearing length is optimized for each profile. For thin walls (1-2mm), we use a longer bearing length (8-12mm) to create more resistance and stabilize metal flow, while for thicker walls (3-5mm), a shorter bearing (2-5mm) is used to allow faster flow. The die is also designed with a slight taper to compensate for thermal expansion during extrusion. During production, we maintain strict control over billet temperature using induction heaters that can adjust temperature within ±2°C. The extrusion speed is monitored in real-time using a laser speed sensor, and the press operator can adjust the ram speed to maintain consistent metal flow. For profiles with multiple cavities, we use a porthole die design where the metal flow is balanced by adjusting the size of the portholes. The die temperature is maintained using cartridge heaters in the die holder, keeping it within a range of 450-480°C. After extrusion, the profile passes through a water quench system that cools it uniformly, preventing warpage that could affect wall thickness. The final control comes from our in-line laser profile scanner, which measures the wall thickness at multiple points along the profile every second. If any deviation exceeds ±0.1mm, the system automatically adjusts the extrusion speed or die temperature. For critical applications, we also perform manual measurements using a micrometer at the beginning and end of each billet. Statistical process control (SPC) charts are maintained to track trends, allowing us to predict and prevent deviations before they occur. This comprehensive system allows us to achieve wall thickness tolerances of ±0.05mm for standard profiles and ±0.02mm for precision profiles.

What causes surface defects like die lines and how are they prevented?

Die lines are one of the most common surface defects in aluminum extrusion, appearing as longitudinal streaks or lines along the length of the profile. They are caused by wear or damage to the die bearing surface, which creates a rough area that scratches the aluminum as it exits the die. The primary causes include abrasive wear from hard particles in the aluminum, thermal fatigue from repeated heating and cooling cycles, and mechanical damage from improper handling or cleaning. To prevent die lines, we implement a rigorous die maintenance program. After every production run, the die is inspected under a microscope for any signs of wear or damage. The bearing surface is polished using a diamond paste to restore a smooth finish. For dies that show significant wear, we apply a nitriding treatment to harden the surface, extending the die life by 3-5 times. During production, we use a billet with a fine grain structure and low iron content to reduce abrasive wear. The billet is also homogenized properly to eliminate hard intermetallic particles that can cause scratching. The extrusion speed is kept within optimal ranges: for 6063 alloy, speeds above 50 m/min can cause excessive die wear due to increased friction. We also use a lubricant system that applies a thin film of graphite or boron nitride to the die face, reducing friction and preventing aluminum from sticking to the die. If die lines do appear, they can often be removed by polishing the die in situ using a ceramic stone. For critical surface finishes like anodized profiles, we schedule die re-polishing after every 500 meters of extrusion to maintain a flawless surface. Additionally, we use a die preheating system that brings the die to operating temperature gradually, reducing thermal shock and extending die life. By combining these preventive measures, we achieve die line-free surfaces for over 90% of our production runs.

How does the quenching process affect the mechanical properties of aluminum extrusions?

Quenching is a critical step in the aluminum extrusion process that directly determines the final mechanical properties of the profile. After the aluminum exits the die at temperatures between 520°C and 560°C, it must be cooled rapidly to retain the alloying elements in solid solution. The quenching rate—how fast the temperature drops—affects the formation of precipitates during subsequent aging. For 6xxx series alloys, a fast quench rate (above 50°C per second) is necessary to keep magnesium and silicon in solution, allowing them to form strengthening Mg2Si precipitates during aging. If the quench rate is too slow, the alloying elements will precipitate prematurely, resulting in lower strength after aging. For example, 6063 alloy quenched at 10°C per second will have a yield strength of only 80 MPa after aging, compared to 140 MPa when quenched at 50°C per second. However, too fast a quench rate can cause distortion or cracking in thin-walled profiles due to thermal stresses. Our factory uses a multi-zone water spray system that can adjust the quench rate based on the profile thickness. For profiles with wall thicknesses less than 2mm, we use a water mist that provides a quench rate of 30-40°C per second, reducing the risk of distortion. For thicker profiles (over 4mm), we use a full water spray that achieves 60-80°C per second. The quench water temperature is maintained at 25-30°C using a heat exchanger, ensuring consistent cooling. After quenching, the profile temperature drops to below 100°C within 10 seconds, locking the alloying elements in solution. The quench rate also affects the grain structure: a fast quench produces a finer grain size, which improves strength and toughness. For profiles that require high corrosion resistance, such as marine applications, a slower quench rate is used to reduce the risk of stress corrosion cracking. Our quality control team monitors the quench rate using thermocouples embedded in the profile, and any deviation from the specified range is immediately corrected. This precise control ensures that our extrusions consistently meet the required mechanical properties for their intended application.

What is the maximum length of aluminum extrusion that can be produced?

The maximum length of an aluminum extrusion depends on several factors, including the press capacity, profile complexity, and handling capabilities. In our factory, the primary limitation is the length of the run-out table, which is the cooling and handling system after the press. Our run-out table is 60 meters long, allowing us to produce profiles up to 55 meters in length, with 5 meters reserved for the saw and handling area. However, for complex profiles with thin walls or multiple cavities, the maximum length may be shorter due to the risk of distortion during cooling. For example, a simple solid rod can be extruded to the full 55 meters, while a complex hollow profile with 1mm walls may be limited to 30 meters to maintain straightness. Another factor is the billet length: a standard billet is 6 meters long, and the extrusion ratio (the reduction in cross-sectional area) determines how much length is produced from one billet. For a profile with a cross-section of 10 cm², a 6-meter billet with a diameter of 200mm (cross-section 314 cm²) will produce approximately 188 meters of profile. However, the profile is cut into shorter lengths for handling and shipping. The practical maximum length for shipping is typically 12 meters for standard truck transport, though longer lengths can be shipped using specialized trailers or by sea. For very long profiles used in structural applications like bridge beams, we can produce lengths up to 30 meters and ship them on flatbed trucks with escort vehicles. The maximum length is also influenced by the customer’s requirements: for window frames, lengths of 6 meters are common, while for curtain walls, 12-meter lengths are typical. Our factory can accommodate custom lengths as long as they are within the physical constraints of our equipment and shipping logistics. For lengths beyond 55 meters, we can use a multiple-billet extrusion process where the press is reloaded while the profile is still being extruded, allowing continuous production of very long profiles.

How do you ensure the corrosion resistance of anodized aluminum extrusions?

Ensuring the corrosion resistance of anodized aluminum extrusions involves a multi-step process that starts with the quality of the aluminum itself and continues through the anodizing and sealing stages. The first critical factor is the alloy composition: alloys with high copper content (like 2024) are difficult to anodize and have lower corrosion resistance, while 5xxx and 6xxx series alloys are ideal. Our factory uses primarily 6063 and 6061 alloys, which have low copper content (less than 0.1%) and form a consistent anodic layer. The anodizing process itself must be carefully controlled: the sulfuric acid concentration is maintained at 15-18%, the temperature at 20±1°C, and the current density at 1.5-2.0 A/dm². These parameters ensure the formation of a dense, uniform oxide layer with minimal porosity. The thickness of the anodic layer is directly related to corrosion resistance: for indoor applications, a 10-micron coating is sufficient, but for outdoor or marine environments, we apply 20-25 microns. The sealing step is the most critical for corrosion resistance. After anodizing, the porous oxide layer is sealed by immersing the profile in hot deionized water at 95-98°C for 20 minutes. This hydrates the aluminum oxide, converting it to boehmite (AlO(OH)), which expands and closes the pores. The sealing quality is tested using a dye stain test: a drop of dye is placed on the surface, and after 5 minutes, it is wiped off. If the surface is properly sealed, no stain should remain. We also perform a salt spray test per ASTM B117, where samples are exposed to a 5% salt fog for 500 hours. After the test, the surface is examined for pitting or corrosion. For extra protection, we offer a two-step sealing process where the profiles are first sealed in hot water, then treated with a nickel acetate solution that further enhances corrosion resistance. The entire process is documented with batch numbers, allowing us to trace any corrosion issues back to the specific production conditions. By following these rigorous procedures, our anodized extrusions can withstand over 1,000 hours of salt spray testing without significant corrosion.

What are the common challenges in extruding hollow profiles?

Extruding hollow profiles presents several unique challenges compared to solid profiles, primarily due to the complexity of metal flow through a porthole die system. The first challenge is achieving uniform metal flow to all cavities. In a porthole die, the aluminum is split into multiple streams that flow through separate portholes, then re-weld in a welding chamber before exiting through the die orifice. If the flow is unbalanced, one cavity may fill faster than another, causing the profile to twist or have uneven wall thickness. To address this, our die designers use FEA software to optimize the size and shape of each porthole, ensuring equal flow resistance. The welding chamber depth is also critical: a deeper chamber allows more time for the metal streams to fuse together, reducing the risk of weld lines. The second challenge is maintaining the integrity of the weld lines where the metal streams recombine. These weld lines are inherently weaker than the base metal, and if not properly formed, can lead to cracking or leakage in pressure applications. We control the welding temperature by maintaining the die temperature at 480-500°C and the billet temperature at 480-520°C, ensuring the metal is hot enough to fuse completely. The extrusion speed is also reduced for hollow profiles, typically 10-20 m/min, to allow sufficient time for welding. The third challenge is die deflection: the high pressure (up to 15,000 psi) can cause the die to deflect, altering the shape of the profile. To mitigate this, we use a die design with a thicker support plate and a backer that distributes the load evenly. For very complex hollow profiles, we use a multi-piece die system where the die is divided into a mandrel and a die ring, allowing for easier adjustment. After extrusion, hollow profiles are more prone to distortion during quenching due to uneven cooling. We use a programmed quench system that applies water at different rates to different parts of the profile, ensuring uniform cooling. Despite these challenges, our factory successfully produces hollow profiles with multiple cavities, including those with complex internal geometries for heat sinks and fluid channels.

How does the extrusion ratio affect the final product quality?

The extrusion ratio, defined as the cross-sectional area of the billet divided by the cross-sectional area of the extruded profile, is a fundamental parameter that significantly influences product quality. A higher extrusion ratio means the aluminum undergoes more deformation, which can improve mechanical properties through grain refinement. For example, an extrusion ratio of 50:1 will produce a finer grain structure than a ratio of 10:1, resulting in higher strength and better surface finish. However, there are limits: if the ratio is too high (above 100:1 for most alloys), the aluminum may experience excessive shear stress, leading to surface cracking or internal voids. The optimal extrusion ratio depends on the alloy and profile complexity. For 6063 alloy, ratios between 20:1 and 60:1 are typical, while for 6061, ratios between 15:1 and 40:1 are common. The extrusion ratio also affects the extrusion speed: a higher ratio requires slower speeds to prevent overheating and tearing. For a profile with a ratio of 80:1, the extrusion speed may be limited to 10 m/min, while a ratio of 20:1 allows speeds up to 50 m/min. The ratio also influences die wear: higher ratios create more friction and heat, accelerating die wear. To compensate, we use a harder die material (H13 steel with nitriding) and reduce the bearing length to minimize friction. The extrusion ratio also affects the dimensional accuracy: a higher ratio can cause more die deflection, requiring tighter control over die design and press parameters. Our factory uses a computer-controlled press that can adjust the ram speed in real-time based on the extrusion ratio and profile geometry. We also perform a trial run for each new profile to determine the optimal extrusion ratio and parameters. By carefully selecting the extrusion ratio, we can achieve a balance between productivity, mechanical properties, and surface quality, ensuring that the final product meets all specifications.

What is the role of the stretcher in the extrusion process?

The stretcher is a critical piece of equipment in the aluminum extrusion line that serves multiple purposes: straightening the profile, relieving residual stresses, and improving dimensional accuracy. After the profile exits the die and is quenched, it may have some curvature or twist due to uneven cooling or metal flow. The stretcher grabs both ends of the profile and applies a controlled tensile force, typically 0.5-2% of the profile’s length. This elongation straightens the profile by plastically deforming it, aligning the grain structure and removing any bends or twists. The amount of stretch is carefully controlled: too little stretch (less than 0.5%) may not fully straighten the profile, while too much stretch (over 3%) can cause the profile to become brittle or develop surface cracks. The stretcher also relieves residual stresses that are locked into the profile during extrusion and quenching. These stresses, if not relieved, can cause the profile to distort during subsequent machining or heat treatment. By applying a uniform tensile strain, the stretcher redistributes the stresses, making the profile more stable. The stretcher is equipped with grippers that can accommodate profiles of various shapes, including hollow and complex geometries. For hollow profiles, special mandrels are inserted into the cavities to prevent collapse during stretching. After stretching, the profile is released and measured for straightness using a laser alignment system. Any profile that does not meet the straightness tolerance (typically 0.5mm per meter) is re-stretched or scrapped. The stretcher also improves the dimensional accuracy by correcting any slight variations in length that occurred during extrusion. For profiles that require tight length tolerances, the stretcher can be used to adjust the length by up to 50mm. In our factory, the stretcher is operated by a skilled technician who monitors the force and elongation in real-time, making adjustments as needed. This process ensures that every profile meets the geometric requirements for its intended application, whether it is a simple window frame or a complex structural component.

How do you handle quality control for custom or complex profiles?

Handling quality control for custom or complex profiles requires a tailored approach that goes beyond standard inspection procedures. The first step is a detailed review of the customer’s specifications, including drawings, tolerances, and any special requirements like surface finish or mechanical properties. Our engineering team uses 3D modeling software to simulate the extrusion process and identify potential issues such as die deflection, metal flow imbalance, or quenching distortion. Based on this analysis, we design a custom die and establish a process control plan that specifies parameters for each step of production. During the trial run, we produce a sample profile and subject it to comprehensive testing. This includes dimensional inspection using a CMM, surface quality assessment under a microscope, and mechanical testing for tensile strength and hardness. For complex profiles with multiple cavities or thin walls, we also perform a CT scan to check for internal voids or weld line integrity. The trial run results are documented and compared to the customer’s specifications. If any deviations are found, we adjust the die design or process parameters and run another trial. Once the trial is approved, we move to full production, but with increased inspection frequency. For standard profiles, we inspect one sample per 100 meters, but for custom profiles, we inspect one sample per 20 meters. We also use in-line monitoring systems that track critical parameters like extrusion speed, temperature, and pressure in real-time. If any parameter goes out of range, the system automatically stops the press and alerts the operator. For very complex profiles, we assign a dedicated quality control technician who monitors the entire production run. After production, each profile is individually inspected for visual defects, and a final dimensional check is performed on a random sample. All inspection data is compiled into a quality report that is sent to the customer with the shipment. For custom profiles that require certification, we can provide EN 10204 Type 3.1 or 3.2 certificates, which include test results and traceability information. This rigorous approach ensures that even the most complex custom profiles meet the highest quality standards.